If you wanted to pack a snowball and ambush some sucker with it in the dead of spring, most folks would not think of immediately hopping on a plane to Hawaii to gather the base materials. More like Alaska. But you could indeed go south: Today there is a winter-weather advisory out for Hawaii's Big Island summits, including Mauna Kea and Mauna Loa above 8,000 feet*. According to the National Weather Service, they're getting just about everything up there: "Freezing rain and snow along with areas of freezing fog will continue over the summits...creating hazardous road conditions."

The wintry scene above was taken Saturday at the United Kingdom Infrared Telescope on Mauna Kea. Those are probably gobs of frozen snow on the lens, rather than floating space amoebas attacking the observatory. (Hat tip to the great site Pacific Island Parks for the photo.) The snow gets thick enough on the peak that people can snowboard on it. Check it out: